


Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Mostly Cloudy
79°F
26°C
Humidity | 94% |
Wind Speed | SE 10 mph |
Barometer | 29.84 in (1009.4 mb) |
Dewpoint | 77°F (25°C) |
Visibility | 10.00 mi |
Heat Index | 83°F (28°C) |
Last update | 18 May 12:56 am CDT |
Extended Forecast for
4 Miles SW San Marcos TX
Overnight
Low: 75 °F
Mostly Cloudy
Sunday
High: 95 °F
Haze then
Partly SunnySunday Night
Low: 75 °F
Mostly Cloudy
Monday
High: 96 °F
Mostly Cloudy
then Slight
Chance
T-stormsMonday Night
Low: 72 °F
Partly Cloudy
then Slight
Chance
T-stormsTuesday
High: 98 °F
Sunny
Tuesday Night
Low: 67 °F
Partly Cloudy
Wednesday
High: 94 °F
Mostly Sunny
Wednesday Night
Low: 64 °F
Mostly Cloudy
Detailed Forecast
Overnight
Mostly cloudy, with a low around 75. South southeast wind around 10 mph.
Sunday
Widespread haze before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 95. Heat index values as high as 103. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 96. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 30 mph.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday
Sunny, with a high near 98. South wind around 5 mph becoming north in the afternoon.
Tuesday Night
Partly cloudy, with a low around 67. Northeast wind around 5 mph.
Wednesday
Mostly sunny, with a high near 94. East northeast wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 64. East wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 94.
Thursday Night
Partly cloudy, with a low around 64.
Friday
Sunny, with a high near 95.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 96.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
4 Miles SW San Marcos TX
29.86°N 97.99°W (Elev. 748 ft)
29.86°N 97.99°W (Elev. 748 ft)
12:44 am CDT May 18, 2025
1am CDT May 18, 2025-6pm CDT May 24, 2025